How to check the performance of a hard drive (Either via terminal or GUI). The write speed. The read speed. Cache size and speed. Random speed.
Is there something more you want?
Suominen is right, we should use some kind of sync; but there is a simpler method, conv=fdatasync will do the job:
I would not recommend using
Another point of view must be the sync time inclusion; all modern filesystems use caching on file operations.
To really measure disk speed and not memory, we must sync the filesystem to get rid of the caching effect. That can be easily done by:
with that method you get output:
so the disk datarate is just 104857600 / 0.441 = 237772335 B/s --> 237MB/s
That is over 100MB/s lower than with caching.
If you want to monitor the disk read and write speed real-time you can use the iotop tool.
This is useful to get exact information about how a disk performs for a particular application or task. The output will show you read/write speed per process, and total read/write speed for the server, much similar to
To install iotop:
To run it:
bonnie++ is the ultimate benchmark utility I know for linux.
(I'm currently preparing a linux livecd at work with bonnie++ on it to test our windows-based machine with it!)
It takes care of the caching, syncing, random data, random location on disk, small size updates, large updates, reads, writes, etc. Comparing a usbkey, a harddisk (rotary), a solid-state drive and a ram-based filesystem can be very informative for the newbie.
I have no idea if it is included in Ubuntu, but you can compile it from source easily.
some hints on how to use bonnie++
A bit more at: SIMPLE BONNIE++ EXAMPLE.
protected by Community♦ Feb 12 '14 at 16:23
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